On 2015/11/18 20:25, Julien Grall wrote:
Hi Shannon,
On 17/11/15 09:57, shannon.zhao@xxxxxxxxxx wrote:
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 62f591f..c084ba6 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -664,6 +664,55 @@ int gnttab_setup_auto_xlat_frames(phys_addr_t addr)
}
EXPORT_SYMBOL_GPL(gnttab_setup_auto_xlat_frames);
+int __init xlated_setup_gnttab_pages(void)
+{
+ struct page **pages;
+ xen_pfn_t *pfns;
+ void *vaddr;
+ int rc;
+ unsigned int i;
+ unsigned long nr_grant_frames = gnttab_max_grant_frames();
+
+ BUG_ON(nr_grant_frames == 0);
+ pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
+ if (!pages)
+ return -ENOMEM;
+
+ pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
+ if (!pfns) {
+ kfree(pages);
+ return -ENOMEM;
+ }
+ rc = alloc_xenballooned_pages(nr_grant_frames, pages, 0 /* lowmem */);
Can you rebase your patch on top of linux/master? The 3rd parameters has
been dropped for alloc_xenballooned_pages.
Sure, I rebase this patchset on Linux 4.3 and will rebase on master at
next version.
+ if (rc) {
+ pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
+ nr_grant_frames, rc);
+ kfree(pages);
+ kfree(pfns);
+ return rc;
+ }
+ for (i = 0; i < nr_grant_frames; i++)
+ pfns[i] = page_to_pfn(pages[i]);
This code needs to be adapt for 64KB page granularity. Please use
page_to_xen_pfn here.
Ok.
+
+ vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
+ if (!vaddr) {
+ pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
+ nr_grant_frames, rc);
+ free_xenballooned_pages(nr_grant_frames, pages);
+ kfree(pages);
+ kfree(pfns);
+ return -ENOMEM;
+ }
+ kfree(pages);
+
+ xen_auto_xlat_grant_frames.pfn = pfns;
+ xen_auto_xlat_grant_frames.count = nr_grant_frames;
+ xen_auto_xlat_grant_frames.vaddr = vaddr;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xlated_setup_gnttab_pages);
+
void gnttab_free_auto_xlat_frames(void)
{
if (!xen_auto_xlat_grant_frames.count)
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index 4478f4b..fa31e66 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -177,6 +177,7 @@ struct grant_frames {
extern struct grant_frames xen_auto_xlat_grant_frames;
unsigned int gnttab_max_grant_frames(void);
int gnttab_setup_auto_xlat_frames(phys_addr_t addr);
+int xlated_setup_gnttab_pages(void);
void gnttab_free_auto_xlat_frames(void);
#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
Regards,
--
Shannon
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